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. 2017 Mar 27;7:448. doi: 10.1038/s41598-017-00559-0

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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ORS285 nifV deletion affects the symbiotic interaction with Aeschynomene evenia (CIAT22838). (A) Comparison of the growth of A. evenia plants inoculated with ORS285, ORS285 ΔnifV and ORS285 ΔnifV+pMG105-nifV. Non-inoculated plants (ni) were used as control. (B) Mature nodules on A. evenia plants inoculated with different ORS285 derivatives. Note the presence of green colored nodules (indicated with a black arrow) on A. evenia plants inoculated with the ORS285 ΔnifV strain. (C) Nodulation kinetics of Bradyrhizobium ORS285 (wt), ΔnifV and ΔnifV+pMG105-nifV (ΔnifV+nifV) derivatives on A. evenia plants. The mean number of nodules per plant (n = 10) at various days post infection (dpi) is presented. Error bars represent standard errors of the mean. (D) Acetylene reducing activity of A. evenia plants inoculated with Bradyrhizobium ORS285, ΔnifV and ΔnifV+nifV derivatives at 22 dpi. The mean amount of produced ethylene per hour and per plant is indicated. Error bars represent standard errors of the mean (n = 10). An ANOVA was performed among the different conditions, followed by Tukey’s post hoc analysis (P < 0.05). The different letters above the bars indicate groups that differ significantly.